Isolation valve with integral pressure relief

ABSTRACT

A fluid isolation valve having a valve body with a first fluid flow port, a second fluid flow port and a fluid drain port with a valve in the fluid drain port. The valve body also defines a fluid flow channel, a drain flow channel and a valve portion, wherein the valve portion is disposed in the valve body to be communicated with the first fluid flow port, the second fluid flow port and the fluid drain port. A flow diversion device is also provided and is disposed within the valve portion. The flow diversion device is configurable between a first configuration and a second configuration, such that when the flow diversion device is in the first configuration the first fluid flow port is communicated with the second fluid flow port. Consequently, when the flow diversion device is in the second configuration the first fluid flow port is communicated with the fluid drain port. The fluid flow can be decrease or stop by use of the valve within the fluid drain port.

CROSS REFERENCE TO RELATED APPLICATIONS

This Patent Application is a Continuation-in-Part of U.S. patentapplication Ser. No. 10/573,094 filed Mar. 23, 2006, which is a NationalStage of International Application No. PCT/US04/31167 filed on Sep. 23,2004, which claims priority from U.S. Provisional Patent ApplicationSer. No. 60/505,193, filed on Sep. 23, 2003, all of which areincorporated herein by reference.

FIELD OF THE INVENTION

This invention relates generally to isolation valves and moreparticularly to isolation valves for an in-line appliance.

BACKGROUND OF THE INVENTION

Isolation valves are well known and are traditionally used in plumbingand heating applications to control the flow of water or other fluid toand from an in-line appliance or piece of equipment for purposes ofmaintenance, replacement or repair. However, current designs are largeand bulky and do not allow for a full fluid flow. This is undesirablefor many reasons. In-line appliances are typically disposed in limitedspaces, thus the large bulky size of current designs make themcumbersome and difficult to install in limited spaces. In some cases thelimited space makes them impossible to install, remove and/or repair.Furthermore, some in-line appliances, e.g. tankless water heaters, aretested by fluid flow rates and temperature calculations.Disadvantageously, the partial fluid flow capability of current designsmakes it difficult for the in-line appliance to be accurately tested orsubject to maintenance.

SUMMARY OF THE INVENTION

A fluid isolation valve is provided having a valve body with a firstfluid flow port, a second fluid flow port and a fluid drain port with avalve in the fluid drain port. The valve body also defines a fluid flowchannel, a drain flow channel and a valve portion, wherein the valveportion is disposed in the valve body to facilitate fluid communicationwith the first fluid flow port, the second fluid flow port and the fluiddrain port. A flow diversion device is also provided and is disposedwithin the valve portion. The flow diversion device is configurablebetween a first configuration and a second configuration, such that whenthe flow diversion device is in the first configuration wherein thefirst fluid flow port is communicated with the second fluid flow port.Consequently, when the flow diversion device is in the secondconfiguration the first fluid flow port is communicated with the fluiddrain port.

Advantageously, the fluid isolation according to the invention allowstesting of an installed in-line appliance and easy cleaning and flushingof any such in-line appliance.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other features and advantages of the present inventionwill be more fully understood from the following detailed description ofillustrative embodiments, taken in conjunction with the accompanyingdrawing in which:

FIG. 1 is a perspective view of a first embodiment of a hot waterisolation valve according to the invention in a first configuration;

FIG. 2 is a perspective view of the hot water isolation valve of FIG. 1in a second configuration;

FIG. 3 is a perspective view of a second embodiment of a cold waterisolation valve according to the invention in a first configuration;

FIG. 4 is a perspective view of the cold water isolation valve of FIG. 3in a second configuration;

FIG. 5A is a perspective view of a third embodiment of a cold waterisolation valve according to the invention;

FIG. 5B is side view of the third embodiment of a cold water isolationvalve according to the invention;

FIG. 6A is a perspective view of a third embodiment of a hot waterisolation valve according to the invention;

FIG. 6B is a side view of the third embodiment of a hot water isolationvalve according to the invention;

FIG. 7A is a schematic front view of ball portion of a ball valve in afirst configuration according to an illustrative embodiment of theinvention;

FIG. 7B is a schematic bottom view of ball portion of a ball valve in afirst configuration according to an illustrative embodiment of theinvention;

FIG. 7C is a schematic front view of ball portion of a ball valve in asecond configuration according to an illustrative embodiment of theinvention;

FIG. 7D is a schematic bottom view of ball portion of a ball valve in asecond configuration according to an illustrative embodiment of theinvention;

FIG. 8 is a cross-sectional view of a hot water isolation valve havinghot water relief port and a hot water relief valve incorporated therein;and

FIG. 9 is a diagrammatic representation of a tankless water heaterdisposed between a water source and a plumbing system.

DETAILED DESCRIPTION

Referring to FIG. 1, a hot water isolation valve 100 is shown andincludes a first hot water port 102, a second hot water port 104, a hotwater relief port 106 and a hot water drain port 108. Hot waterisolation valve 100 defines a hot water flow channel 101 and a hot waterdrain channel 103. The hot water flow channel 101 provides fluidcommunication between the first hot water port 102 and the second hotwater port 104. The hot water drain channel 103 provides fluidcommunication between the first hot water port 102 and the hot waterdrain port 108. The hot water isolation valve 100 includes a flowdiversion device (not shown), such as a ball valve, disposed within avalve portion 110 disposed between first hot water port 102, second hotwater port 104, hot water relief port 106 and hot water drain port 108.Moreover, the flow diversion device is configurable between a firstconfiguration and a second configuration via a flow adjustment means112, such as a lever, wing, oval or butterfly handle, for example.

In FIG. 1, the flow diversion device is shown in a first configurationwherein hot water flow is between first hot water port 102 and secondhot water port 104. In FIG. 2, the flow diversion device is shown in asecond configuration wherein hot water flow is between first hot waterport 102 and hot water drain port 108. It should be noted that hot waterrelief port 106 includes a threaded portion (female) for receiving a hotwater relief valve. However, although hot water relief port 106 is shownhaving a threaded (female) portion, it should be appreciated that hotwater relief port 106 may be configured for connecting with a hot waterrelief valve in any manner suitable to the desired end purpose, such asa threaded portion (male), a friction fit connector, a crimpedconnector, a clamped connector, a quick disconnect connector, or thelike. Additional embodiments of the invention included a pressure reliefvalve in communication with the pressure relief port 106. In certainembodiments the pressure relief valve can be built into the valve bodyor into the pressure relief port 106 thereof. Other embodiments caninclude a pressure relief valve that is external to the valve body andoperably connected to the pressure relief port 106.

Illustrative embodiments of the present invention include a flowdiversion device, such as a ball valve, which allows the hot waterrelief port 106 to be open in both configurations of the flow adjustmentmeans 112. For example, in the first configuration, the hot water flowis between the first hot water port 102 and the second hot water port104, and is also open to the hot water relief port 106. In the secondconfiguration, the hot water flow is between the first hot water port102 and the hot water drain port 108 and is also open to the hot waterrelief port 106. This allows fluid communication between the first hotwater port 102 and the hot water relief port 106 regardless ofconfiguration of the flow diversion device. A hot water relief valve canbe provided in communication with the hot water relief port such thatthe hot water relief valve is always in fluid communication with thefirst hot water relief port 102. This embodiment provides an importantsafety feature which can prevent an overpressure condition in a systemor appliance such as a tankless water heater to which the inventive hotwater valve is installed. 15 Referring to FIG. 3, a cold water isolationvalve 200 is shown and includes a first cold water port 202, a secondcold water port 204 and a cold water drain port 206. Cold waterisolation valve 200 defines a cold water flow channel 201 and a coldwater drain channel 203, wherein cold water flow channel 201 is disposedto communicate first cold water port 202 with second cold water port 204and wherein cold water drain channel 203 is disposed to communicatesecond cold water port 204 with cold water drain port 206. Cold waterisolation valve 200 also includes a flow diversion device, such as aball valve, disposed within a valve portion 208. Valve portion 208 isdisposed between first cold water port 202, second cold water port 204and cold water drain port 206. Moreover, the flow diversion device isconfigurable between a first configuration and a second configurationvia a flow adjustment means 210. In FIG. 3, the flow diversion device isshown in a first configuration wherein cold water flow is between firstcold water port 202 and second cold water port 204. In FIG. 4, the flowdiversion device is shown in a second configuration wherein cold waterflow is between second cold water port 204 and cold water drain port206.

Referring to FIGS. 5A and 5B, a further illustrative cold waterisolation valve 500 according to the invention is shown and includes afirst cold water port 502, a second cold water port 504 and a cold waterdrain port 506 having a drain valve 501. In this further illustrativeembodiment, the drain valve 501 is a ball valve fitted with a drainvalve handle 507. The drain valve handle 507 is a one leaf handle thatallows actuation of the drain valve 501 in a more compact valve design.It is contemplated within the scope of the invention that the drainvalve 501 can be without a handle and be actuated by a set screw, anyhandle configuration or the like. It is also contemplated within thescope of the invention that the drain valve 501 can be other than a ballvalve such as a traditional stem and valve seat design or the like.

The cold water isolation valve 500 defines a cold water flow channel 503and a cold water drain channel 505, wherein the cold water flow channel503 is disposed to communicate the first cold water port 502 with thesecond cold water port 504 and wherein the cold water drain channel 505is disposed to communicate the first cold water port 502 with the coldwater drain port 506. The cold water isolation valve 500 also includes aflow diversion device, such as a ball valve 509, disposed within a valveportion 508. The ball valve 509 is actuated with a butterfly handle 511.It is contemplated within the scope of this invention that the ballvalve 509 can be actuated with a single lever handle, set screw,circular handle or the like. The valve portion 508 is disposed betweenthe first cold water port 502, second cold water port 504 and cold waterdrain port 506. Moreover, the flow diversion device is configurablebetween a first configuration, i.e. to open the cold water flow channel503, and a second configuration, i.e. to open the cold water drainchannel 505, via the ball valve 509.

Turning to FIG. 5B, a cut-a-way side view of the flow diversion deviceis shown. In a first configuration, the cold water flow is between thefirst cold water port 502 and second cold water port 504. The ball valve509 has a second configuration wherein cold water flow is between thefirst cold water port 502 and cold water drain port 506. Advantageously,the drain port 506 may be fitted with the drain valve 501, which allowsa operator of the valve 500 the ability to check flow within the secondconfiguration while affixing a drainage or pumping device to the coldwater drain port 506. The first cold water port 502 has a unionconnection 533 with a threaded portion (female) allowing for reliablesealing of the cold water isolation valve 500 within a plumbing system.The union connection 533 has a union nut 534 that sealably attaches thecold water isolation valve to the plumbing system with the use of aunion washer 513. The union connection 533 further contains an insulator505 formed of a polymeric material. The insulator 505 precludes galvanicaction that might occur when a nipple or a pipe connecting to the valve500 is iron or a metal dissimilar to the valve 500.

The second cold water port 504 has a threaded portion (female) allowingfor threaded engagement to the plumbing system. It is contemplatedwithin the scope of the invention that either cold water port 502, 504can have a union connection or threaded connection. It is furthercontemplated within the scope of the invention that either cold waterport 502, 504 can have other means of attachment known in the art suchas threaded portion (male), a friction fit connector, a sweatconnection, a crimped connector, a clamped connector, a quick disconnectconnector, flange or the like.

According to the invention, the ball valve 509 allows for at least twoconfigurations of fluid flow. A ball 520 forming the ball valve 509 isseated within the valve body with a first polymeric valve seat 522, asecond polymeric valve seat 523, a third polymeric valve seat 527 and afourth polymeric valve seat 528. In one illustrative embodiment, thevalve seats 522, 523, 527, 528 are formed of Teflon®. It is contemplatedwithin the scope of the invention that any polymeric material havingsufficient sealing qualities may be used. The ball valve 509 ispositioned within the valve housing by way of a ball valve cap 530.

Affixed to the ball 520 is a valve stem 524. The valve stem 524 issealably seated into the valve body with a polymeric valve stem seat 526and a valve stem nut 529. Attached to the valve stem 524 is thebutterfly handle 511 that is secured by the use of a handle nut 531.Within the ball 520 geometric channels allow for various flow diversionsto and from the ports 502, 504 and cold water drain port 508.

Referring to FIGS. 6A and 6B, a hot water isolation valve 600 is shownand includes a first hot water port 602, a second hot water port 604, ahot water relief port 606 and a hot water drain port 608. The hot waterdrain port 608 is fitted with a drain port valve 601. The hot waterisolation valve 600 defines a hot water flow channel 603 and a hot waterdrain channel 605. The hot water flow channel 603 provides fluidcommunication between the first hot water port 602 and the second hotwater port 604. The hot water flow channel 603 is also open to the hotwater relief port 606. The hot water drain channel 605 provides fluidcommunication between the first hot water port 602 and the hot waterdrain port 608 having a drain port valve 601. The hot water drainchannel 605 is also open to the hot water relief port 606. The hot waterisolation valve 600 includes a ball valve 609 as a flow diversiondevice, disposed within a valve portion 610 between first hot water port602, second hot water port 604, hot water relief port 606 and hot waterdrain port 608 having the drain port valve 601. Moreover, the ball valve609 is configurable between a first configuration and a secondconfiguration via a handle 612. In a first configuration, the hot waterflow is between first hot water port 602, second hot water port 604 andhot water relief port 606. In a second configuration the hot water flowis between first hot water port 602, hot water drain port 608 and hotwater relief port 606.

According to the illustrative embodiments of invention, the hot waterrelief port 606 includes a threaded portion (female) for receiving a hotwater relief valve. Although the hot water relief port 606 is shownhaving a threaded (female) portion, it should be appreciated that hotwater relief port 606 may be configured for connecting with a hot waterrelief valve in any manner suitable to the desired end purpose, such asa threaded portion (male), a friction fit connector, a crimpedconnector, a clamped connector, a quick disconnect connector, or thelike. Alternative embodiments of the invention can include a hot waterrelief valve that is incorporated with the hot water relief port ratherthan being connected thereto.

Turning to FIG. 6B, a cut-a-way side view of the flow diversion deviceis shown. In a first configuration hot water flow is between first hotwater port 602 and second hot water port 604. The flow diversion device,ball valve 609, has a second configuration wherein hot water flow isbetween first hot water port 602 and hot water drain port 608.Advantageously, the drain port 608 is fitted with the drain valve (notshown), which allows a user of the hot water isolation valve 600 theability to check flow within the second configuration while affixing adrainage or pumping device to the hot water drain port 608.

The first hot water port 602 has a union connection 633 with a threadedportion (female) allowing for reliable sealing of the hot waterisolation valve 600 within a plumbing system. The union connection 633has a union nut 634 that sealably attaches the hot water isolation valve600 to the plumbing system with the use of a union washer 613. The unionconnection 633 has an insulator 605 formed of a polymeric material. Theinsulator 605 precludes galvanic action that might occur when a nippleor a pipe connecting to the valve 600 is iron or a metal dissimilar tothe valve 600.

The second hot water port 604 has a threaded portion (female) allowingfor threaded engagement to the plumbing system. It is contemplatedwithin the scope of the invention that either hot water port 602, 604can have a union connection or threaded connection. It is furthercontemplated within the scope of the invention that either hot waterport 602, 604 can have other means of attachment known in the art suchas threaded portion (male), a friction fit connector, a crimpedconnector, a clamped connector, a quick disconnect connector, or thelike.

According to the invention, the ball valve 609 allows for at least twoconfigurations of fluid flow. A ball 620 forming the ball valve 609 isseated within the valve body with a first polymeric valve seat 622, asecond polymeric valve seat 623, a third polymeric valve seat 627 and afourth polymeric valve seat 628. It one illustrative embodiment thevalve seats 622, 623, 627, 628 are formed of Teflon®. It is contemplatedwithin the scope of the invention that any polymeric material havingsufficient sealing qualities may be used. The ball valve 609 ispositioned within the valve housing by way of a ball valve cap 630.

Affixed to the ball 620 is a valve stem 624. The valve stem 624 issealably seated into the valve body with a polymeric valve stem seat 626and a valve stem nut 628. Within the ball 620 geometric channels allowfor various flow diversions to and from the ports 602, 604 and hot waterdrain port 608.

A more detailed description of the ball 620 forming ball valve 609according to illustrative embodiments of the present invention isprovided with referring to FIGS. 7A-7D. FIG. 7A is a schematic frontview of the ball 620 in a first configuration wherein the rotationalaxis 712 is oriented vertically and handle 710 is rigidly attached tothe top of ball 620 so that turning the handle 710 can rotate the ballabout the rotational axis 712 within the ball valve 609 (FIG. 6B). Whenthe ball is installed in a hot water valve, the schematic front viewshown in FIGS. 7A and 7C coincide with a view into the hot water drainport with handle on top. In the first configuration, a through-hole 714passes through the center of the ball 620 to provide an open flow pathfrom a first hot water port 702 to a second hot water port 704. A firstblind-hole 716 is co-axially aligned with the rotational axis 712 andpasses from the ball surface that is opposite from the handle attachmentpoint into the through hole 714 to provide a flow path to hot waterpressure relief port 706. FIG. 7B is a schematic bottom view of the ball620 in a first configuration wherein the rotational axis 712 isorthogonal to the page. A second blind hole 718 is orthogonal to a planeformed by the rotational axis 712 and the central axis of through hole714. In the first configuration shown in FIG. 7B, a hot water drain port708 is closed and the second blind hole 718 extends from the ballsurface opposite the hot water drain port 708 to the ball center andintersects both the through hole 714 and the first blind hole 716.

FIG. 7C is a schematic front view of the ball 620 in a secondconfiguration wherein the rotational axis 712 is oriented vertically andhandle 710 is rigidly attached to the top of ball 620 so that turningthe handle 710 can rotate the ball about the rotational axis 712 withinthe ball valve 609 (FIG. 6B). In the second configuration, the throughhole 714 is aligned with the hot water drain port 708 and the secondblind hole 718 is aligned with the first hot water port 702 to providean open flow path between the hot water drain port 708 and first hotwater port 702. In the second configuration, no flow path is provided tosecond hot water port 704. Because the first blind hole 706 is coaxiallyaligned with the rotational axis 712, its always remains aligned withhot water relief port 706. This provides an open flow path between thehot water relief port 706 and first hot water port 702 in both first andsecond configurations. In the second configuration, the hot water reliefport is also open to the hot water drain port 708. FIG. 7D is aschematic bottom view of the ball 620 in the second configurationwherein rotational axis 712 is orthogonal to the page. The ball as shownin FIG. 71) is rotated 90 degrees counterclockwise relative to the ballas shown in FIG. 7B while the locations of first hot water port 702,second hot water port 704, hot water drain port 708 and hot waterpressure relief port 706 remain constant.

A cross sectional view of an illustrative embodiment of the presentinvention is shown in FIG. 8 in which a hot water relief valve 802 isbuilt into the hot water relief port 806 of a hot water isolation valve800. In this embodiment, the hot water relief valve 802 is oriented inparallel with the second hot water port. Although the illustrativeembodiment is shown wherein the hot water relief port 804 includes acorner portion 806 so that the hot water relief valve 802 is oriented inparallel with the second hot water port 808, it should be appreciated bypersons having skill in the art that the hot water relief port 804 canbe provided with no comer portion 806 or with a corner portion formedwith a different angle from that shown, without departing from the scopeof the present invention.

Referring to FIG. 9, a typical in-line appliance set up is shown andincludes a tankless water heater 300 connected between a water source302 (such as a well or water main) and a plumbing system 304 (such as aplumbing system supplying a building), wherein tankless water heater 300includes a first tankless water port 306 and a second tankless waterport 308.

Referring to FIG. 9 and FIGS. 1-4, cold water isolation valve 200 isconnected to water source 302 via first cold water port 202 and tanklesswater heater 300 via second cold water port 204 which is connected tofirst tankless water port 306. When the flow diversion device of coldwater isolation valve 200 is in a first configuration, cold water isallowed to flow from water source 302, into first cold water port 202,through the cold water flow channel 201 (FIG. 3), out of second coldwater port 204 and into first tankless water port 306. When the flowdiversion device of cold water isolation valve 200 is in a secondconfiguration, the flow path of cold water isolation valve 200 isbetween cold water drain port 206 and second cold water port 204 tofacilitate draining the tankless water heater 300 via cold water drainchannel 203 (FIG. 3). In the second position or configuration of thecold water isolation valve 200 the cold water is prevented from flowinginto tankless water heater 300 via first cold water port 202. A coldwater drain flow stop 212 (FIG. 3) or a drain valve may be provided forsealing off cold water drain port 206, thus completely preventing coldwater from flowing through cold water isolation valve 200.

Hot water isolation valve 100 is connected to tankless water heater 300via second tankless water port 308 which is connected to first hot waterport 102. Additionally, hot water isolation valve 100 is connected toplumbing system 304 via second hot water port 104. When the flowdiversion device of hot water isolation valve 100 is in a firstconfiguration, hot water is allowed to flow from second tankless waterport 308, into first hot water port 102 through the hot water flowchannel 101 (FIG. 1), out of second hot water port 104 and into plumbingsystem 304. When the flow diversion device of hot water isolation valve100 is in a second configuration, hot water is allowed to flow fromsecond tankless water port 308, into first hot water port 102 throughthe hot water drain channel 103 (FIG. 1) and out of hot water drain port108 to facilitate draining the hot water side of the system (andemptying the tankless water heater). In the second configuration, wateris prevented from flowing into plumbing system 304. A hot water drainflow stop 114 (FIG. 1) or drain valve may be provided for sealing offhot water drain port 108, thus preventing water from flowing through hotwater isolation valve 100.

This above described design advantageously allows for tankless waterheater 300 and/or plumbing system 304 to be drained or flushed out. Forexample, when the flow diversion device of cold water isolation valve200 is in the second configuration ,a flushing device containing aflushing fluid, such as water or chemical solvent, may be connected tocold water drain port 206 to inject the flushing fluid into cold waterdrain port 206. The flushing fluid will flow through cold water drainchannel 203, out of second cold water port 204, into first tanklesswater port 306 and through tankless water heater 300. The flushing fluidwill then flow out of second tankless water port 308 and into first hotwater port 102. If the flow diversion device of hot water isolationvalve 100 is in the second configuration, the allowable flow path of theflushing fluid is between first hot water port 102 and hot water drainport 108, advantageously allowing tankless water heater 300 to beflushed. It should be appreciated that the above described flushing mayalso be performed in a reverse manner using hot water drain port 108 asan inlet flow port and cold water drain port 206 as an outlet flow port.

It is contemplated that one objective of this valve is to isolate thecold water feed and the hot water piping to a plumbing system so thatthe water heater can be replaced. These tankless on-demand water heaterstypically mount onto a wall with fastening devices. To replace the unit,the valves can be shut off, the unions (e.g. first hot water port 102and second cold water port 204) disconnected and the water heaterremoved from the wall. The drain ports having valves will be used totest the system and flush out the water heater with chemicals when thewater source 302 and plumbing system 304 are disconnected. The drainport valves allow an operator to control the flow of fluids through thetankless water heater 300, which allows an operator greater convenienceand safety for testing and flushing operations. A pressure relief valvethreaded into the hot water isolator valve will always be open to thewater heater no matter what position the ball is in because the holewill be opposite the stem.

This innovative design will advantageously save space and time and offera full fluid flow. The full fluid flow of the drain is important becausethe hot water heater is tested by fluid flow and temperaturecalculation. Moreover, space is also critical because these units areinstalled in small spaces. This design is less than half the length ofcurrent designs advantageously allowing these new isolation valves to beused in small spaces.

A cold water isolation valve and a hot water isolation valve may bepackaged together. Moreover, it should be appreciated that any sizevalve and configuration suitable to the desired end purpose may be used.

It should be appreciated that first hot water ports 102 and first coldwater ports 204 are union connections, as is known in the art, forconnecting hot water isolation valve 100 and cold water isolation valve200 to tankless water heater 300.

Although an exemplary embodiment of hot water isolation valves and coldwater isolation valves includes a forged -brass construction, hot waterisolation valves and cold water isolation valves may be constructed, inwhole, in part or in combination, using any material suitable to thedesired end purpose, such as cast brass, copper, iron, plastic and/or acomposite material, such as polycarbonate. Moreover, althoughconnections between hot water isolation valves, cold water isolationvalves plumbing system and tankless water heater are shown and describedas threaded screw type connections, it should be appreciated that theseconnections may be any connections suitable to the desired end purpose,such as friction fit connectors, crimped connectors, clamped connectors,quick disconnect connectors, or the like.

Although an exemplary embodiment of hot water isolation valves and coldwater isolation valves show their use in connecting a tankless waterheater to a plumbing system, it should be appreciated by those skilledin the art that the inventive isolation valves can be used to attach andisolate other plumbing appliances or plumbing systems known in the artwithin an overall plumbing system.

Although the invention has been shown and described with respect toexemplary embodiments thereof, various other changes, omissions andadditions in the form and detail thereof may be made therein withoutdeparting from the spirit and scope of the invention.

1. A fluid isolation valve comprising: a valve body, said valve bodyhaving a first fluid flow port, a second fluid flow port a fluid drainport, and a hot water relief port; and a flow diversion device disposedwithin said valve portion, said flow diversion device being configurablebetween a first configuration and a second configuration, such that whensaid flow diversion device is in said first configuration said firstfluid flow port is communicated with said second fluid flow port andsaid hot water relief port and when said flow diversion device is insaid second configuration said first fluid flow port is communicatedwith said fluid drain port and said hot water relief port.
 2. The fluidisolation valve according to claim 1, wherein said flow diversion deviceis a ball valve unit comprising: a ball section, said ball sectiondefining a stem chamber and a ball chamber, said stem chamber disposedadjacent to and extending outwardly from said ball chamber; a stemdisposed within and extending outwardly from said stem chamber andconnected to said ball disposed within said ball chamber, an exposedportion of said stem extending beyond said stem chamber; a handleconnected to said exposed portion of said stem disposed within said stemchamber and connected to said ball, wherein actuation of said handleeffects actuation of said ball for operating said ball valve unit; and amain section disposed separate from and adjacent to said ball section;and a drain port communicating with said main section.
 3. The fluidisolation valve according to claim 2, wherein said drain port has drainport valve disposed within.
 4. The fluid isolation valve according toclaim 3, wherein said drain port valve is a ball valve unit.
 5. Thefluid isolation valve according to claim 3, wherein said drain portvalve is a stem and seat valve.
 6. The fluid isolation valve accordingto claim 1, further including an end cap attached to at least one ofsaid main section and said ball section.
 7. The fluid isolation valveaccording to claim 6, wherein said main section is made of brass.
 8. Thefluid isolation valve according to claim 1, wherein said first fluidflow port is fitted with a union connection and said second fluid flowport is fitted with a threaded connection.
 9. The fluid isolation valveaccording to claim 8 wherein said union connection further comprises aunion connection insulator.
 10. A fluid isolation valve comprising avalve body, said valve body having a first fluid flow port, a secondfluid flow port a fluid drain port, wherein and a hot water relief port;and a flow diversion device comprising: a ball rotatable about an axisof rotation; a through hole perpendicular to said axis of rotation andextending through the center of said ball; a first blind hole coaxiallyaligned with said axis of rotation and extending through the surface ofsaid ball to the center of the said ball; and a second blind holealigned perpendicular to said axis of rotation and said through hole andextending through the surface of said ball to the center of said ball.11. The fluid isolation valve according to claim 10 wherein said firstblind hole is aligned with said hot water relief port.
 12. The fluidisolation device according to claim 11 wherein said flow diversiondevice is selectable between a first configuration wherein said throughhole is aligned with said first fluid flow port and said second fluidflow port and a second configuration wherein said through hole isaligned with said first fluid flow port and said second blind hole isaligned with said fluid drain port.
 13. The fluid isolation deviceaccording to claim 10 further comprising: a handle attached to the ballon said rotational axis to allow manual rotation of the ball about therotational axis.
 14. The fluid isolation device according to claim 12wherein in said second configuration, said ball is angularly displacedby about 90 degrees about said rotational axis relative to the ballsorientation in said first configuration.
 15. The fluid isolation valveaccording to claim 1 wherein said hot water relief port includes apressure relief valve incorporated therein.
 16. The fluid isolationvalve according to claim 1 further comprising: a hot water relief valvein communication with said hot water relief port.